git post-receive hook for tracking puppet environments on the same machine

post-receive-puppetbranches

#!/bin/sh
read oldrev newrev refname

REPO="/my/repo.git"
BRANCH=`echo $refname | sed -n 's/^refs\/heads\///p'`
BRANCH_DIR="/etc/puppet/environments"

#Unset GIT_DIR and GIT_WORK_DIR so git chooses them by current directory
#Based on behaviour of git post-receive hook, undocumented
unset GIT_DIR
unset GIT_WORK_DIR

if [ "$newrev" -eq 0 ] 2> /dev/null ; then
  # branch is being deleted
  echo "Deleting remote branch $BRANCH_DIR/$BRANCH"
  cd $BRANCH_DIR && rm -rf $BRANCH
else
  # branch is being updated
  echo "Updating remote branch $BRANCH_DIR/$BRANCH"
  { cd $BRANCH_DIR/$BRANCH && git fetch \
    && git reset --hard origin/$BRANCH ; } \
    || { mkdir -p $BRANCH_DIR && cd $BRANCH_DIR \
    && git clone $REPO $BRANCH && cd $BRANCH \
    && git checkout -b $BRANCH origin/$BRANCH ; }
fi